Molly and a pseudocode

Molly was given a pseudocode by her teacher and told her you need to understand the pseudocode to answer the riddle.

Riddle:

I am _________ like universe and stars
You will find me in computer _________
I start over and over until you are _________
Who am I? I am _________

I will add more phrases as hints if nobody is able to find the answer...

Here is the pseudocode it is a hint:

var a = "2#12jJIUP^()";
if(!a){
return "123456";
}else{
key(a);
}

key(z){
lock(z);
}

lock(z){
key(z);
}